Limitations of full text search

[EricM]

Does someone know what document types would be indexed with the full-text search capability?

I see that it indexes PDF files, but I'm not seeing that there are any hits on .doc or .docx or .odt. Perhaps I'm missing some extension, or maybe I've made a mistake during installation? I'm using a Linux host, if that makes any difference.

Any advice would be greatly appreciated.